I tested five herbicides on dandelions in cold weather. Soil temp was 33 and air temp was 35 at the time of application, November 12, 2013. Temperatures remained between 28 and 55. I tried to use label rates, but with squirt bottles, its an estimation. I used enough for 1000 sqft in 1-quart bottles. After 10 days, I thought Speedzone was the most effective, T-Zone was almost as effective. A three-way, Surge and Quicksilver were less effective--or perhaps slower to work. I just thought you would want to see. Sorry the first two, focus was poor, until I changed to the close-up setting. Not shown...Lesco Razorburn (glyphosate plus diquat) turned grass brown.